Here in the Bay Area we have this little problem with the earthquakes. So when you buy a house, everyone tells you to make sure it's tied to its foundation with six-inch-long anchor bolts. That way, when the big one hits, your house (hopefully) doesn't end up looking like this.
Fortunately for us, our house was bolted down when we moved in. Unfortunately for us, the detached garage was not. So, not too long ago, we borrowed a hammer drill, picked up a bagful of anchor bolts from the local OSH, and got down to the task of insuring our garage against an untimely demise.
The actual drilling wasn't too bad -- just tedious. First you have to drill through the floor plate, and then you switch the bit and hold on tight as the drill starts hammering and grinding away the concrete. This goes on for a few minutes until your calves start to cramp up and you pull back on the drill to find out how far you still have to go. At that point, you realize that you're only about one-sixth of the way done, so you blow the cement dust out of the hole and curse and wipe it all off your face and then get back to work.
After drilling fifteen holes like this all around the perimeter of the garage, it was time to start filling them with epoxy and dropping the bolts down into them. Here's a little advice: Epoxy hardens quickly. Very, very quickly. All went well with the first couple bolts we put in, but I was having a little trouble with the third one, so I let G get ahead of me with the epoxy -- and that's where it all went downhill. By the time I got to the fourth and fifth bolts, I was having a hard time getting the suckers to sink more than an inch or two into the floor. By the sixth bolt, I was using a mini sledge to drive the bolt into the epoxy, somewhat unsuccessfully. By the seventh bolt, it was all over.
This is where I offer another bit of advice: Don't try drilling through hardened epoxy. It might seem like it's easier than drilling a bunch of new holes, but then again your drill bit might just suddenly get stuck and blow out the motor in that hammer drill you borrowed. I'm just saying.
There's not really much else to the story. We bought a new hammer drill to replace the one we broke and we spent another weekend using it to drill a bunch of new holes next to the old ones. Then we were very, very careful not to fill the new holes with epoxy until we had each bolt ready to go -- and this time, it all went well. And once everything dried, we tightened the nuts, swept the garage floor clean, and decided not to do another house project for a very long time. That turned out to be about two weeks.